Mitsubishi Galant (2004+). Manual - part 1210

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-533

STEP 9. Using the oscilloscope, check the No. 6 cylinder 
injector.

(1) Disconnect the No. 6 cylinder injector connector B-26 and 

connect the test harness special tool (MB991658) between 
the separated connectors. (All terminals should be 
connected)

(2) Connect the oscilloscope probe to the injector side 

connector terminal No. 2.
NOTE: When measuring with the PCM side connector, dis-
connect the all PCM connectors and connect check har-
ness special tool (MB991923) between the separated 
connectors. Then connect an oscilloscope probe to terminal 
No. 127.

(3) Start the engine and run at idle.

(4) Measure the waveform.

• The waveform should show a normal pattern similar to 

the illustration.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?

YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-6

.

NO :  Replace the PCM. Then go to Step 10.

STEP 10. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13B-5

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0206 set?

YES : Repeat the troubleshooting.
NO :  The procedure is complete.

AK303116

M

1

2

CONNECTOR: B-26

B-26 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AB

AK102980

1 2

INJECTOR
CONNECTOR

MB991658

AC

OSCILLOSCOPE

AKX01557 AB

A

NORMAL  WAVEFORM

A:INJECTOR DRIVE TIME

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-534

DTC P0222: Throttle Position Sensor (Sub) Circuit Low Input

CAUTION

If DTC P0222 has been set, TCL related DTC 
U1120 is also set. After P0222 has been diag-
nosed, don't forget to erase DTC U1120.

.

AK302855

YELLO

W

-RED

WHITE-RED

BLA

CK-WHITE

B-06

5 V

94

5

THROTTLE
POSITION
SENSOR 
(SUB)

POWERTRAIN CONTROL MODULE (PCM)

98

95

6

3

Throttle Position Sensor (Sub) Circuit

6

1 2 3 4 5

B-22

100

99

92

91

93 94 95

96 97 98

101 102 103 104

105 106 107 108

109 110 111 112 113

HALL IC

AK303042

THROTTLE BODY ASSEMBLY
(INCORPORATING THROTTLE
POSITION SENSOR)

B-06 (B)

CONNECTOR: B-06

AB

AK303043

CONNECTOR: B-22

B-22 (B)

PCM

AB

AIR CLEANER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-535

CIRCUIT OPERATION

• A 5-volt power supply is applied on the throttle 

position sensor (sub) power terminal (terminal 
No. 5) from the PCM (terminal No. 94).
The ground terminal (terminal No. 3) is grounded 
with PCM (terminal No. 95).

.

TECHNICAL DESCRIPTION

• The throttle position sensor (sub) outputs voltage 

which corresponds to the throttle valve opening 
angle.

• The PCM checks whether the voltage is within a 

specified range.

.

DESCRIPTIONS OF MONITOR METHODS
Throttle position sensor (sub) output voltage is out of 

specified range.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-536

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Ignition switch is "ON" position.

Judgement Criteria

• Throttle position sensor (sub) output voltage 

should be 2.25 volts or less for 0.5 second.

.

OBD-II DRIVE CYCLE PATTERN
None.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Throttle position sensor failed.

• Open or shorted throttle position sensor (sub) cir-

cuit, harness damage, or connector damage.

• PCM failed.

START

YES

YES

YES

NO

NO

NO

CONTINUOUS

FAILURE FOR 0.5sec

MALFUNCTION

END

GOOD

OUTPUT VOLTAGE

< =2.25V

OUTPUT VOLTAGE > =4.8V

AK302390